<template>
  <HomePannel title="热门品牌" sub-title="国际经典 品质保证">
    <template v-slot:right>
      <a @click="toggle(-1)" href="javascript:;" class="iconfont icon-angle-left prev"
        :class="{ disabled: index === 0 }"></a>
      <a @click="toggle(1)" href="javascript:;" class="iconfont icon-angle-right next"
        :class="{ disabled: index === 1 }"></a>
    </template>
    <div class="box" ref="target">
      <ul class="list" :style="{ transform: `translateX(${-index * 1240}px)` }">
        <li v-for="item in brands" :key="item.id">
          <RouterLink to="/">
            <img :src="item.picture" alt="">
          </RouterLink>
        </li>
      </ul>
    </div>
  </HomePannel>
</template>
<script>
import HomePannel from './home-pannel'
import { ref } from 'vue'
import { findBrand } from '@/api/home'
import { useLazyData } from '@/hooks'

export default {
  name: 'HomeBrand',
  components: { HomePannel },
  setup() {
    // 获取数据
    /* const brands = ref([])
    findBrand(10).then(data => {
      brands.value = data.result
    }) */
    const { target, result } = useLazyData(() => findBrand(10))
    // 切换效果
    const index = ref(0)
    const toggle = step => {
      const newIndex = index.value + step
      if (newIndex < 0) return
      if (newIndex > 1) return
      index.value = newIndex
    }
    /* const currentBrands = computed(() => {
      return brands.value.slice(5 * index.value, 5 * (index.value + 1))
    })
 */
    return { brands: result, index, toggle, target }
  }
}
</script>
<style scoped lang='less'>
.home-panel {
  background: #f5f5f5
}

.iconfont {
  width: 20px;
  height: 20px;
  background: #ccc;
  color: #fff;
  display: inline-block;
  text-align: center;
  margin-left: 5px;
  background: @xtxColor;

  &::before {
    font-size: 12px;
    position: relative;
    top: -2px
  }

  // 禁用可点击
  &.disabled {
    background: #ccc;
    cursor: not-allowed;
  }
}

.box {
  display: flex;
  width: 100%;
  height: 345px;
  overflow: hidden;
  padding-bottom: 40px;

  .list {
    width: 200%;
    display: flex;
    transition: all 1s;

    li {
      margin-right: 10px;
      width: 240px;

      &:nth-child(5n) {
        margin-right: 0;
      }

      img {
        width: 240px;
        height: 305px;
      }
    }
  }
}
</style>